<!--父级页面:控制除登录页以外所有页面共有的左侧菜单栏与顶部条-->
<template>
  <div style="display: flex">
<!--    左侧菜单栏-->
    <div :style="{width:(isCollapse?'64px' : '208px')}" >
      <el-menu
          background-color="#3c82f5"
          style="width: 100%;height: 100vh;"
          text-color="#fff"
          active-text-color="#ff0"
          :collapse="isCollapse"
          unique-opened
          router
          :collapse-transition
      >
        <!--菜单的顶部条-->
        <el-row style="padding: 10px">
          <el-col :span="2"></el-col>
          <el-col :span="7">
            <el-avatar src="imgs/admin/logo.png" style="width: 35px;height: 35px;"></el-avatar>
          </el-col>
          <el-col :span="isCollapse? 0 : 13 ">
            <span style="color: #FFF;font-weight: bold;position: relative;top: 8px;left: 2px">智慧车辆</span>
          </el-col>
        </el-row>
        <el-sub-menu index="1">
          <template #title>
            <el-icon><User/></el-icon><span>用户管理</span>
          </template>
          <el-menu-item index="/user">用户列表</el-menu-item>
        </el-sub-menu>
        <el-sub-menu index="2">
          <template #title>
            <el-icon style="font-size: 21px"><Van/></el-icon><span>车辆管理</span>
          </template>
          <el-menu-item index="/vehicle">车辆列表</el-menu-item>
        </el-sub-menu>
        <el-sub-menu index="3">
          <template #title>
            <el-icon style="font-size: 21px"><Location/></el-icon><span>围栏管理</span>
          </template>
          <el-menu-item index="/geofence">围栏列表</el-menu-item>
        </el-sub-menu>
        <el-sub-menu index="4">
          <template #title>
            <el-icon style="font-size: 21px"><Place/></el-icon><span>调度管理</span>
          </template>
          <el-menu-item index="/application">申请列表</el-menu-item>
          <el-menu-item index="/audit">审批列表</el-menu-item>
          <el-menu-item index="/distribute">车辆分配</el-menu-item>
        </el-sub-menu>
        <el-sub-menu index="5">
          <template #title>
            <el-icon style="font-size: 21px"><MessageBox/></el-icon><span>数据字典</span>
          </template>
          <el-menu-item index="/dict">字典列表</el-menu-item>
        </el-sub-menu>
      </el-menu>
    </div>
    <!--右侧顶部条与注意内容(可变区域)-->
    <div :style="{width:(isCollapse ? 'calc(100% - 64px)' : 'calc(100% - 208px)')}">
      <!--右侧顶部条-->
      <el-header style="height: 10vh;background-color: #fff;padding-top: 22px">
        <el-row>
          <!--折叠图标按钮-->
          <el-col :span="18">
            <el-icon style="font-size: 20px;" @click="changeCollapse"><Expand/></el-icon>
          </el-col>
          <!--登录人姓名与退出登录-->
          <el-col :span="6" style="position: relative">
            <el-dropdown trigger="click" style="position: absolute;right: 20px">
              <span style="font-size: 19px;font-weight: bold">
                {{ user.username }}
                <el-icon class="el-icon--right">
                  <arrow-down />
                </el-icon>
              </span>
              <template #dropdown>
                <el-dropdown-menu>
                  <el-dropdown-item @click="logout">退出登录</el-dropdown-item>
                </el-dropdown-menu>
              </template>
            </el-dropdown>
          </el-col>
        </el-row>
        <!--面包屑导航-->
        <el-breadcrumb separator="/" style="position: relative;top: 20px">
          <el-breadcrumb-item>首页</el-breadcrumb-item>
          <el-breadcrumb-item v-for="item in breadcrumb">{{item}}</el-breadcrumb-item>
        </el-breadcrumb>
      </el-header>
      <!--右侧主体内容(可变区域)-->
      <el-main style="height: 90vh;padding: 0px;overflow-y: auto;">
        <router-view/>
      </el-main>
    </div>
  </div>
</template>

<script setup>
import {onMounted, ref} from "vue";
import {useRoute, useRouter} from "vue-router";


const isCollapse=ref(false)
const changeCollapse=()=>{
  isCollapse.value=!isCollapse.value
}
const user=ref(getUser());

//定义退出登录的方法
const logout=()=>{
  if (confirm('您确认要退出吗?')){
    //清空localStorage中的user数据
    localStorage.removeItem(('user'));
    //跳转至登录页
    window.location.href='/login';
    //也需要将刚刚取出的登录人数据清除
    user.value ='';
  }
}

//定义对象用来维护路由path与面包屑的对应关系
let map = {
  '/user':['用户管理','用户列表'],
  '/vehicle':['车辆管理','车辆列表'],
  '/geofence':['围栏管理','电子围栏'],
  '/application':['调度管理','申请列表'],
  '/audit':['调度管理','调度审核'],
  '/distribute':['调度管理','用车分配'],
  '/dict':['字典管理','字典列表']
}

//定义对象用来保存面包屑前展示的值
const breadcrumb=ref(['围栏管理','电子围栏'])

//useRoute()是Vue提供的一个方法,用户管理当前组件的路由状态,获取当前路由对象
const route = useRoute();
// 一进入页面立即加载
onMounted(()=>{
  updateBreadcrumb(route);
})
//定义更新面包屑导航值的方法
const updateBreadcrumb=(route)=>{
  //根据当前路由的path属性,从map对象中获取对应的面包屑值
  const path=route.path;
  //根据当前的path把对应的面包屑数组取出来
  breadcrumb.value=map[path];
  console.log(breadcrumb.value);
}
//获取路由守卫，监听路由，只要path发生了改变(报货点击左侧菜单栏)，就立即更新面包屑的值，再跳转
const router=useRouter();
router.beforeEach((to,from,next)=>{
  updateBreadcrumb(to);
  next();
})

</script>